warning: creating a mutable reference to mutable static is discouraged
  --> $DIR/issue-20801.rs:14:14
   |
LL |     unsafe { &mut GLOBAL_MUT_T }
   |              ^^^^^^^^^^^^^^^^^ mutable reference to mutable static
   |
   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
   = note: this will be a hard error in the 2024 edition
   = note: this mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior
   = note: `#[warn(static_mut_refs)]` on by default
help: use `addr_of_mut!` instead to create a raw pointer
   |
LL |     unsafe { addr_of_mut!(GLOBAL_MUT_T) }
   |              ~~~~~~~~~~~~~            +

error[E0507]: cannot move out of a mutable reference
  --> $DIR/issue-20801.rs:27:22
   |
LL |     let a = unsafe { *mut_ref() };
   |                      ^^^^^^^^^^ move occurs because value has type `T`, which does not implement the `Copy` trait
   |
note: if `T` implemented `Clone`, you could clone the value
  --> $DIR/issue-20801.rs:3:1
   |
LL | struct T(u8);
   | ^^^^^^^^ consider implementing `Clone` for this type
...
LL |     let a = unsafe { *mut_ref() };
   |                      ---------- you could clone this value
help: consider removing the dereference here
   |
LL -     let a = unsafe { *mut_ref() };
LL +     let a = unsafe { mut_ref() };
   |

error[E0507]: cannot move out of a shared reference
  --> $DIR/issue-20801.rs:30:22
   |
LL |     let b = unsafe { *imm_ref() };
   |                      ^^^^^^^^^^ move occurs because value has type `T`, which does not implement the `Copy` trait
   |
note: if `T` implemented `Clone`, you could clone the value
  --> $DIR/issue-20801.rs:3:1
   |
LL | struct T(u8);
   | ^^^^^^^^ consider implementing `Clone` for this type
...
LL |     let b = unsafe { *imm_ref() };
   |                      ---------- you could clone this value
help: consider removing the dereference here
   |
LL -     let b = unsafe { *imm_ref() };
LL +     let b = unsafe { imm_ref() };
   |

error[E0507]: cannot move out of a raw pointer
  --> $DIR/issue-20801.rs:33:22
   |
LL |     let c = unsafe { *mut_ptr() };
   |                      ^^^^^^^^^^ move occurs because value has type `T`, which does not implement the `Copy` trait
   |
note: if `T` implemented `Clone`, you could clone the value
  --> $DIR/issue-20801.rs:3:1
   |
LL | struct T(u8);
   | ^^^^^^^^ consider implementing `Clone` for this type
...
LL |     let c = unsafe { *mut_ptr() };
   |                      ---------- you could clone this value

error[E0507]: cannot move out of a raw pointer
  --> $DIR/issue-20801.rs:36:22
   |
LL |     let d = unsafe { *const_ptr() };
   |                      ^^^^^^^^^^^^ move occurs because value has type `T`, which does not implement the `Copy` trait
   |
note: if `T` implemented `Clone`, you could clone the value
  --> $DIR/issue-20801.rs:3:1
   |
LL | struct T(u8);
   | ^^^^^^^^ consider implementing `Clone` for this type
...
LL |     let d = unsafe { *const_ptr() };
   |                      ------------ you could clone this value

error: aborting due to 4 previous errors; 1 warning emitted

For more information about this error, try `rustc --explain E0507`.